WO2012154089A1 - Procédés dans une station de base pour gérer un transfert intercellulaire, station de base, programme d'ordinateur et produit programme d'ordinateur - Google Patents

Procédés dans une station de base pour gérer un transfert intercellulaire, station de base, programme d'ordinateur et produit programme d'ordinateur Download PDF

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Publication number
WO2012154089A1
WO2012154089A1 PCT/SE2011/050570 SE2011050570W WO2012154089A1 WO 2012154089 A1 WO2012154089 A1 WO 2012154089A1 SE 2011050570 W SE2011050570 W SE 2011050570W WO 2012154089 A1 WO2012154089 A1 WO 2012154089A1
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WIPO (PCT)
Prior art keywords
base station
base stations
handover
target base
user equipment
Prior art date
Application number
PCT/SE2011/050570
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English (en)
Inventor
Tomas Nylander
Jari Vikberg
Tomas Hedberg
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to PCT/SE2011/050570 priority Critical patent/WO2012154089A1/fr
Priority to EP11722620.9A priority patent/EP2705689B1/fr
Priority to US14/115,810 priority patent/US9516555B2/en
Publication of WO2012154089A1 publication Critical patent/WO2012154089A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports

Definitions

  • the invention relates to the field of handovers of user equipment between base stations in wireless communication systems, and in particular means and methods for handling physical cell identity confusion situations in such wireless communication systems.
  • Heterogeneous networks are an appealing solution for providing increased capacity to mobile users.
  • Figure 1
  • heterogeneous network 1 comprising a macro base station 2 providing a wide area coverage serving users within a macro cell 3, particularly for users moving at high speed.
  • a macro base station 2 providing a wide area coverage serving users within a macro cell 3, particularly for users moving at high speed.
  • several low power nodes are employed in service areas having a higher density of users requiring high data rates, or hotspots as such areas are denoted. Examples of such low power nodes comprise pico base stations 5 within pico cells 6, relay base stations 8
  • the macro base station 2 could be used for coverage and femto or pico base stations 4, 5 for capacity.
  • a physical cell identity is used in a radio layer for identifying different cells within the communication system and in neighboring cell measurements and measurement reports.
  • Global cell identities are mainly used in other layers, for example in handover routing. The total number of different PCIs is limited in various communication technologies.
  • LTE Long Term Evolution
  • primary and secondary synchronization signals together encode the different LTE cells' PCI, which is composed of the physical layer cell identity group (0, 1, 167) and the physical layer identity
  • PCI allocation is a demanding task in network planning in order to ensure that neighboring cells do not use same PCI.
  • the PCI should be unique and enough for identifying the cell.
  • the above may create specific issues, as the HetNet cells 5, 7, 9 also are identified by a PCI on the radio layer.
  • some of the available different PCIs could be dedicated for HetNet cells 5, 7, 9.
  • PCI confusion which means that the use of only PCI is not enough to uniquely identify a cell, and a global cell identity (e.g. E-UTRAN Cell Global Identity, E-CGI) is required to uniquely identify the HetNet cell.
  • E-CGI E-UTRAN Cell Global Identity
  • Figure 2 illustrates an exemplary case of the above described PCI confusion. In this exemplary case there exists two
  • PCI (101) PCI (101) .
  • a "PCI confusion" situation may occur in the macro base station 13 and in the following some different possible scenarios are mentioned: a) The macro base station 13 is not aware of the "PCI
  • the macro base station 13 is aware of the "PCI confusion” possibility. In this case the macro base station 13 needs to ask the UE 10 to report more information that can be used for uniquely identifying the HetNet cell 11. One possibility is to use Automatic Neighbor Relation (ANR) -like principles to solve the PCI confusion.
  • ANR Automatic Neighbor Relation
  • the macro base station 13 is aware of the "PCI confusion” possibility and knows all cells 11, 12 with that particular PCI (101) and has stored neighbor relation lists for all of them. The macro base station 13 requests a handover
  • An object of the invention is to provide a way of resolving the PCI confusion resulting in resource efficient and fast handovers .
  • the object is according to a first aspect of the invention achieved by a method in a base station for handling handover of a user equipment from the base station to one of two or more target base stations.
  • the method comprises the steps of: detecting a physical cell identity confusion situation;
  • the invention provides a network based solution for overcoming problems related to the PCI confusion in a HetNet scenario, which is faster and more resource efficient than known
  • the invention improves the service experience for the end users, as the need for long gaps in the transmission with the serving cell is removed.
  • the method comprises the further steps of receiving, from one of the target base stations, a message indicating a successful handover; and cancelling the handover preparations towards remaining target base stations.
  • Candidate target base stations that turn out not to be the correct target base station are thereby alleviated from further processing of the handover procedure.
  • the step of detecting a physical cell identity confusion situation comprises receiving a measurement report from the user equipment including a physical cell identity; and identifying in a neighbor relation list multiple entries for the physical cell identity.
  • the use in the base station of a neighbor relation list allowing multiple entries for each radio level identity, i.e. physical identity
  • the step of initiating handover preparations towards the two or more target base stations comprises
  • the received response messages comprise identical radio resource control connection reconfiguration messages .
  • the information element comprises a cell radio network temporary identifier, security settings, antenna configuration information, dedicated random access parameters or uplink Sounding configuration. Several options are thus available for the base station to enable the target base stations to create and transmit identical response messages.
  • the information element comprises a cell radio network temporary identifier chosen from within a range of cell radio network temporary identifier values dedicated for use upon detection of physical cell identity confusion.
  • the base station comprises a base station serving an overlaid cell in a layered communication system and the one or more target base stations comprise base stations serving underlaid cells of the layered communication system, the underlaid cells having coverage areas at least partly overlapping with the coverage area of the overlaid cell.
  • the method is well suited for use in e.g. heterogeneous networks, comprising e.g. macro base station having within its coverage area low power nodes.
  • the object is according to a second aspect of the invention achieved by a base station for handling handover of a user equipment from the base station to one of two or more target base stations, the base station comprising a controller arranged to: detect a physical cell identity confusion
  • an input/output device arranged to: receive response messages from the two or more target base stations, the response messages being based on the transmitted information element and thus being identical, and transmit to the user equipment a unique handover message, enabling the user equipment to perform a handover to appropriate target base station.
  • the object is according to a third aspect of the invention achieved by a computer program for a base station for handling handover of a user equipment from the base station to one of two or more target base stations.
  • the computer program for a base station for handling handover of a user equipment from the base station to one of two or more target base stations.
  • the object is according to a fourth aspect of the invention achieved by a computer program product comprising a computer program as above, and a computer readable means on which the computer program is stored.
  • the object is according to a fifth aspect of the invention achieved by a method in a base station for handling handover of a user equipment from the base station to one of two or more target base stations.
  • the method comprises the steps of detecting a physical cell identity confusion situation;
  • Figure 1 illustrates a heterogeneous network
  • Figure 2 illustrates a PCI confusion situation.
  • Figure 3 illustrates schematically an environment in which embodiments of the invention may be implemented, and also another exemplifying PCI confusion scenario.
  • Figure 4 is a sequence diagram illustrating handover procedure at PCI confusion.
  • Figure 5 illustrates two macro base stations and a pico base station lying within the overlapping coverage areas of the two macro base stations.
  • Figure 6 illustrates steps of a method in an aspect of the invention .
  • Figure 7 illustrates an embodiment of the method in figure 6.
  • Figure 8 illustrates another embodiment of the method in figure 6.
  • Figure 9 illustrates a base station of an aspect of the invention .
  • FIG. 10 illustrates steps of another method in an aspect the invention.
  • Figure 3 illustrates schematically an environment in which embodiments of the invention may be implemented.
  • the invention could for example be implemented in a layered communication system comprising base stations serving overlaid cells and additional base stations serving underlaid cells.
  • underlaid cells have coverage areas at least partly
  • a heterogeneous network 20 is
  • the heterogeneous network 20 comprises a base station 21 in a macro cell 22 serving users, e.g. user equipment 31, located within its coverage area.
  • users e.g. user equipment 31, located within its coverage area.
  • the base station 21 will be exemplified by a macro base station.
  • the heterogeneous network 20 further comprises a number of pico cells 24, 26, 28, 30 with a respective pico base station 23, 25, 27, 29.
  • the pico cells would correspond to the above mentioned underlaid cells, and will be used as an example of low power nodes in the following description when describing aspects of the invention.
  • Figure 3 also illustrates another exemplifying PCI confusion scenario.
  • the pico base stations 23 and 25 have the same PCI (101) configured. All pico base stations have unique E-CGI (2001, 1001, 3001, 4001) .
  • the UE 31 is shown located in the macro cell 22 and is served by the macro base station 21.
  • the macro base station 21 maintains a modified Neighbor
  • NRL Relation List
  • either the macro base station 21 or the pico base stations 23, 25, 27, 29 may also automatically build corresponding X2-interfaces, based on known procedures.
  • a mechanism to maintain the neighbor may also automatically build corresponding X2-interfaces, based on known procedures.
  • the current neighbor relation list in the macro base station 21 may for example comprise entries for pico base station 23, 25 and 27, while pico base station 29 has not yet been added to the neighbor relation list.
  • the UE 31 shown in the figure 3 approaches pico cell 26 (indicated at the arrow), and sends measurement report to the macro base station 21 indicating PCI 101.
  • the macro base station 21 decides that it is time to trigger a handover (based e.g. on conventional received signal strength indication, RSSI, measurements), it also detects that this is a PCI confusion case as the neighbor relation list contains two different entries for the indicated PCI (pico base).
  • the detection of the possibility for PCI confusion comprises using a separate PCI value range for the pico base stations 23, 25, 27, 29 when the PCI confusion is possible.
  • a specific value range e.g. the values between 100 and 149, could be allocated for the pico base stations and in this case, the detection of the possibility for PCI confusion is based on the macro base station being configured with this PCI range information and when receiving a PCI within the PCI range, a PCI confusion is detected.
  • the macro base station 21 has multiple Neighbor Relations for the same PCI . The macro base station 21 thus triggers handover preparation phase towards both the pico base station 23 and pico base station 25 as it doesn't know which of these pico base
  • the macro base station 21 receives the responses to the handover preparation from both pico base stations 23, 25, it sends a single
  • RRCConnection-Reconfiguration message to the UE 31.
  • the UE 31 will then access the correct target target pico base station 25 based on the information received in RRCConnection- Reconfiguration message and the handover execution is
  • FIG. 4 is a sequence diagram illustrating the above handover procedure at PCI confusion.
  • the UE 31 is served by the macro base station 21 (arrow 1) and relevant signaling between them is performed, e.g. UE 31 transmitting traffic data to the macro base station 21.
  • the UE 31 approaches the cell 26 served by the target pico base station 25 and detects the PCI (101) broadcast by the pico base station 25 (arrow 2) .
  • the macro base station 21 receives measurement report for PCI 101 from the UE 31 (arrow 3) and decides that handover is to be triggered.
  • the macro base station 21 detects that PCI 101 results in PCI confusion (box 4) .
  • the target pico base station 21 detects that PCI 101 results in PCI confusion (box 4) .
  • a legacy method to handle this situation is that even when multiple targets are prepared for handover only a single RRC ⁇ ConnectionReconfiguration message is forwarded to the UE .
  • the handover would fail if approaching a different base station than the one composing the received
  • the UE would then attempt an RRC re-establishment procedure, which would succeed if the approached base station was also x prepared' for
  • a first solution is based on that the source base station (macro base station 21) provides the needed instructions to the different target nodes (pico base stations 23, 25) so that these can create the same RRCConnectionReconfiguration message which is then forwarded to the UE 31.
  • a second solution is based on that all the different RRCConnectionReconfiguration messages are provided to the UE 31 which then attempts to access the target cell based on information in the different messages (one by one) . It can be noted that the "intended" target cell 26 may reject the handover preparation for example due to an overload situation, but the source base station 21 obviously doesn't know which of the potential target cells 24, 26 is the
  • the UE 31 may receive a handover command and access the overloaded cell.
  • a new Rejection indication' criterion is defined to trigger RRC re-establishment. There are then chances that the UE 31 may revert back to the original macro cell 22.
  • pico cells should always, or to
  • the first solution is thus based on that the source base station (macro base station 21) provides the needed
  • RRCConnectionReconfiguration message which is then forwarded to the UE 31 by the macro base station 21.
  • C-RNTI cell radio network temporary identifier
  • the C-RNTI handling is as following.
  • a separate value range of the C-RNTI values is allocated for handover purposes in the case of "PCI confusion".
  • the special C-RNTI value range is unique within a macro cell as it controls all its own PCI confusions towards all the pico cells 24, 26, 28, 30 located within its coverage area 22.
  • the source macro base station 21 allocates one of these values and sends this value to the target pico base stations 23, 25, i.e. those having the same PCI.
  • the target pico base stations 23, 25 then includes the C-RNTI value in the RRCConnection
  • Figure 5 illustrates such case, i.e. two macro base stations 105, 115 and a pico base station 125 lying within the overlapping coverage areas 100, 110 of the two macro base stations 105, 115.
  • both macro cells 100, 110 could theoretically allocate the same special C-RNTI value if there would
  • a pico cell 120 can be detected as an overlapping cell to multiple macro cells 100, 110 based on the following logic: 1.
  • the macro base station has an X2-interface to all the known pico base stations in its coverage area.
  • a first macro base station selects the pico base stations that are candidates or known "PCI confusion" cells.
  • the PCI of the pico base stations are known using cell identities, including PCIs, stored internally in the first macro base station.
  • the first macro base station inquires the pico base
  • the communication about the information can alternatively be triggered from the pico base station without the first macro base station
  • the first macro base station now knows which PCIs are candidates for or known "PCI confusion" cells. It also knows which other macro cells have overlapping coverage with each pico cell known by PCI. The next step is that the first macro base station contacts each of the other macro base stations having overlapping coverage areas with the pico cells to check if these cells also have the same PCI as a candidate or are known for "PCI confusion".
  • Still another variant for the above steps is the following:
  • the first macro base station knows its other macro base station neighbors. The first macro base station also knows the PCI values that are candidates for or known for "PCI
  • the first macro base station contacts all the neighboring macro base stations to find out which other macro cells have the same PCI confusion values. Once this is done the
  • the main difference to the above first variant is that more C- RNTI negotiations will be performed as the detection is not really based on a pico base station providing coverage in an overlapping area to both macro cells. This could however be no issue if the number of "PCI confusions" in each macro cell is not large.
  • Pico cells are somehow defined as such and they allocate a range of "handover RNTIs" to each macro cell. If new macro neighbors appear, then the affected pico cell will repeat the RNTI allocation to the "old" macro cell neighbor. Macro cells are assumed not to suffer from PCI confusion.
  • the new security settings in the target cell can be either allocated before or after the handover.
  • the source side referring to figure 3, this would be the macro base station 21
  • the target base stations (pico base stations 23, 25) not to activate any new security settings before the handover.
  • the second solution based on the existing prior art handling of handover preparation and multiple handover preparations, will be described next.
  • the source base station Once the source base station has received responses to all the handover preparations, it creates a new container that can include several of the different RRCConnectionReconfiguration messages received from the different target sides.
  • the new container with multiple RRCConnection-Reconfiguration messages is then sent to the UE 31.
  • the UE 31 will then synchronize with the target base station and attempt to access the target base station based on
  • the maximum number of repetitions is the number of different
  • the new container with multiple RRCConnection- Reconfiguration messages could also be coded in an optimized way so that only information that changes is repeated and constant information is provided only once.
  • Preambles and/or C-RNTIs from the different RRCConnection ⁇ Reconfiguration messages.
  • the macro base station 21 can indicate to the UE 31 which one(s) is/are to continue the handover access signaling.
  • Figure 6 illustrates a flow chart of steps of a method in accordance with one aspect of the invention.
  • the method 50 may be implemented in the base station 21 for handling handover of the user equipment 31 from the base station 21 to one of two or more target base stations 23, 25.
  • the method 50 comprises the first step of detecting 51 a physical cell identity confusion situation.
  • the method 50 comprises the second step of initiating 52 handover preparations towards the two or more target base stations 23, 25.
  • the handover preparations comprise at least conveying an information element to the two or more target base stations 23, 25.
  • the initiation of handover preparations may comprise transmitting to the two or more target base stations 23, 25 a handover request message including the information element.
  • the information element may for example comprise a cell radio network temporary identifier, security settings, antenna configuration information (in LTE
  • AntennalnfoCommon specify dedicated random access parameters (in LTE RACH-ConfigDedicated) or specify the uplink Sounding configuration (sounding reference signals) . It is realized that there are several other information elements that could be used and that the information element could be chosen differently depending on the communication system at hand.
  • the method 50 comprises the third step of receiving 53
  • the received response messages may for example comprise identical radio resource control connection reconfiguration messages (RRC- ConnectionReconfiguration) transmitted by all the base
  • the method 50 comprises the fourth step of transmitting 54 to the user equipment 31 a unique handover message, enabling the user equipment 31 to perform a handover to appropriate target base station 25.
  • the method 50 comprises the further steps of: receiving 55, from one of the target base stations 25, a message indicating a successful handover.
  • the base station 21 then cancels 56 the handover preparations towards remaining target base stations 23.
  • detecting a PCI situation comprises the sub-steps of the base station 21 receiving 57 a measurement report from the user equipment 31, the measurement report including a physical cell identity.
  • the base station 21 is arranged to look up the physical cell identity in a neighbor relation list and
  • the information element comprises a cell radio network temporary identifier (C-RNTI) chosen from within a range of cell radio network temporary identifier values dedicated for use upon detection of the physical cell identity confusion.
  • C-RNTI cell radio network temporary identifier
  • the use of the range of dedicated C-RNTI values may be negotiated between the base station 21 and a macro
  • the invention also encompasses the base station 21.
  • Figure 9 illustrates the macro base station 21 and in particular means for implementing the described methods.
  • the macro base station 21 comprises a processor 82, e.g. a central processing unit, microcontroller, digital signal processor (DSP), etc., capable of executing software instructions stored in a computer program product 83 e.g. in the form of a memory.
  • the processor 82 is connected to an input/output device 81 that receives inputs from user equipment 31, typically via some other device, e.g. a transceivers, of the base station 21.
  • the implementation may comprise distributed hardware so that several CPUs are used rather than one when running the software .
  • the described methods and algorithms or parts thereof for use in handling handover may be implemented e.g. by software and/or application specific integrated circuits in the
  • the macro base station 21 may further comprise a computer program 84 stored on a computer program product 83.
  • the computer program 84 comprises computer program code which when run on the macro base station 21, and in particular the processor 82 thereof, causes the macro base station 21 to perform the methods as described.
  • a computer program product 83 is also provided comprising the computer program 84 and computer readable means on which the computer program 84 is stored.
  • the computer program product 83 can be any combination of read and write memory (RAM) or read only memory (ROM) .
  • the computer program product 83 may also comprise persistent storage, which, for example can be any single one or combination of magnetic memory, optical memory, or solid state memory.
  • Figure 10 illustrates a flow chart over steps of a method implementing the second solution as described earlier.
  • the method 90 is performed in the base station 21 and enables the handling of handover of the user equipment 31 from the base station 21 to one of two or more target base stations, i.e. pico base stations 23, 25.
  • the method 90 comprises the first step of detecting 91 a physical cell identity confusion situation .
  • the method 90 comprises the second step of initiating 92 handover preparations towards the pico base stations 23, 25.
  • the method 90 comprises the third step of receiving 93 response messages from the pico base stations 23, 25.
  • the method 90 comprises the fourth step of creating 94 a container comprising the received response messages.
  • the method 90 comprises the fifth step of transmitting 95 to the user equipment 31 the container comprising the received response message, enabling the user equipment 31 to perform a handover to a selected target pico base station 25.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte sur un procédé (50) dans une station de base (21) pour gérer un transfert intercellulaire d'un équipement utilisateur (31) de la station de base (21) à l'une d'au moins deux stations de base cibles (23, 25). Le procédé (50) comprend les étapes consistant à : détecter (51) une situation de confusion d'identité de cellule physique ; déclencher (52) des préparations au transfert intercellulaire vers les au moins deux stations de base cibles (23, 25) comprenant l'acheminement d'un élément d'information vers les au moins deux stations de base cibles (23, 25) ; recevoir (53) des messages de réponse en provenance des au moins deux stations de base cibles (23, 25), les messages de réponse étant basés sur l'élément d'information envoyé et étant donc identiques ; envoyer (54) à l'équipement utilisateur (31) un message de transfert intercellulaire unique, permettant à l'équipement utilisateur (31) d'effectuer un transfert intercellulaire vers une station de base cible appropriée (25). L'invention porte également sur des stations de base, des programmes d'ordinateur et des produits programmes d'ordinateur.
PCT/SE2011/050570 2011-05-06 2011-05-06 Procédés dans une station de base pour gérer un transfert intercellulaire, station de base, programme d'ordinateur et produit programme d'ordinateur WO2012154089A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/SE2011/050570 WO2012154089A1 (fr) 2011-05-06 2011-05-06 Procédés dans une station de base pour gérer un transfert intercellulaire, station de base, programme d'ordinateur et produit programme d'ordinateur
EP11722620.9A EP2705689B1 (fr) 2011-05-06 2011-05-06 Procédés dans une station de base pour gérer un transfert intercellulaire, station de base, programme d'ordinateur et produit programme d'ordinateur
US14/115,810 US9516555B2 (en) 2011-05-06 2011-05-06 Methods in a base station for handling handover, base station, computer program and computer program product

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PCT/SE2011/050570 WO2012154089A1 (fr) 2011-05-06 2011-05-06 Procédés dans une station de base pour gérer un transfert intercellulaire, station de base, programme d'ordinateur et produit programme d'ordinateur

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WO2014112940A1 (fr) * 2013-01-17 2014-07-24 Telefonaktiebloaget L M Ericsson (Publ) Terminal, nœud de réseau et procédé dans ledit terminal pour permettre l'accès à un réseau de radiocommunications
US9832709B2 (en) 2013-01-17 2017-11-28 Telefonaktiebolaget Lm Ericsson (Publ) Terminal, network node and methods therein for enabling access to a radio communications network
WO2014168526A1 (fr) * 2013-04-08 2014-10-16 Telefonaktiebolaget L M Ericsson (Publ) Noeud de réseau radio, station de base et procédés correspondants
US9549350B2 (en) 2013-04-15 2017-01-17 Nokia Solutions And Networks Oy Methods and apparatus for handover management
WO2014180599A1 (fr) * 2013-05-08 2014-11-13 Nokia Solutions And Networks Oy Retablissement de connexion rrc en presence de confusion de pci

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US20140087735A1 (en) 2014-03-27
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EP2705689A1 (fr) 2014-03-12

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